I think I may have figured out how to do things from the virtual terminals to affect the X screen.
The vt for X is 6 so we can do:
chvt 6 to switch to the virtual terminal 6
Next we need to have a little delay, so let's add sleep 4 (you can also use 2 if you think that's a bit faster)
We also need to add "export DISPLAY=:0" to set the X display.
Then to change the user, we use "sudo -u knoppix "
So to do xrandr and change the resolution: (this is pretty useful when you mess around with screen resolutions that cause a blank screen)
Hit CTRL+ALT+F4 to switch to VT 4: then type
chvt 6; sleep 4; export DISPLAY=:0; sudo -u knoppix xrandr
chvt 6; sleep 4; export DISPLAY=:0; sudo -u knoppix xrandr --output HDMI-1 --mode 800x600
To launch terminator:
chvt 6; sleep 4; export DISPLAY=:0; sudo -u knoppix terminator &
To open the main menu:
chvt 6; sleep 4; export DISPLAY=:0; sudo -u knoppix lxpanelctl menu
Amiga 3000 Motherboard ReAmiga Rev. 1.3 and Daughterboard Rev 9
$119.00
BlueSCSI V2 WiFi (Desktop) Modern Storage for Vintage Computers Latest Model
$53.50
Very Rare Vintage Commodore Amiga 2000 Mechanical Wired Keyboard - UNTESTED
$169.99
Amiga 500 Computer, Power Supply, And Workbench 1.2, Tested
$390.00
Amiga External Drive Adapter and LONG Cables. Works with Gotek and Amiga Drives
$32.00
Cyberstorm PPC Amiga 4000 Phase5 turbocard with 128 Mb RAM -for parts or repair
$1500.00
$237.18
Vampirized Video Toaster Branded Amiga 2000 Desktop Computer w/Flyer Vampire etc
$4799.98
AMIGA 2000 RGBTOHDMI ADAPTER RGB2HDMI DX HDMI
$83.33
Commodore Amiga Stereo Sound Sampler Techno Sound Turbo Rare Limited US Seller
$49.99